/**
 * @desc 生成一个uuid
 * @returns
 */
export function uuid() {
  const s = [];
  const hexDigits = '0123456789abcdef';
  for (let i = 0; i < 36; i++) {
    const start = Math.floor(Math.random() * 0x10);
    s[i] = hexDigits.substring(start, start + 1);
  }
  s[14] = '4'; // bits 12-15 of the time_hi_and_version field to 0010
  const start = (parseInt(s[19]) & 0x3) | 0x8;
  s[19] = hexDigits.substring(start, start + 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01
  s[8] = s[13] = s[18] = s[23] = '';
  return s.join('');
}
